Concrete-molding machine

Abstract

Concrete-molding machine having a ram on which an upper mold part is fastened in a releasable manner. The quick-fastening device used for this purpose comprises connecting pins which have a shank and a widened cross-piece. In order to simplify the device, the connecting pins are fastened on the upper mold part by means of their shanks. Located on the ram or on a carrying plate fixedly connected thereto is a horizontal slide with keyhole-like clearances into which the connecting pins can be inserted from beneath. Pneumatic lifting elements grip below the slide and draw it up, in the connecting position, to the cross-pieces.

I claim: 
     
       1. A concrete-molding machine having a movable ram, and an upper mold part positionable below the movable ram, and comprising: means for clamping the upper mold part to the movable ram in a vibration-resistant manner, said means including: at least one connecting member fastened to one of the movable ram and the upper mold part, said connecting member comprising a shank, and a widened head at one end of said shank;   a horizontally arranged plate attached to the other one of the movable ram and the upper mold part, said plate having at least one opening formed therein for receiving the shank of a respective connecting member;   at least one horizontally arranged slide guided on the plate, said slide having a clearance region with a widened portion and a narrowed portion, and being displaceable from a release position in which the widened head can pass through the widened portion of the clearance region, to a connecting position in which the shank passes through the narrowed portion and the widened head rests against said slide; and   at least one pneumatic lifting element comprising an inflatable cushion positioned to exert a clamping force against said slide.     
     
     
       2. The concrete-molding machine defined in claim 1, wherein said inflatable cushion comprises a lifting cushion having a non-inflated condition in which said cushion has an essentially flat, rectangular shape, said lifting cushion being comprised of a tear-resistant multiple-layer material, and having a connection device positioned on a border thereof for connection with a flexible pressure line. 
     
     
       3. The concrete-molding machine defined in claim 1, wherein said connecting member is fastened to the upper mold part, said horizontally arranged plate comprising a carrying plate attached to an underside of the movable ram and having through-passage openings sized to allow the widened head of said connecting member to pass therethrough, said pneumatic lifting element and said slide being arranged on said carrying plate. 
     
     
       4. The concrete-molding machine defined in claim 3, wherein said pneumatic lifting element further comprises: a plurality of supporting elements positioned on said carrying plate,   a base plate resting on said supporting elements, and   a clamping frame having an upper part positioned above said base plate, and a lower part passing below said base plate, said slide being positioned between said base plate and said lower part, said inflatable cushion being fitted on said base plate.   
     
     
       5. The concrete-molding machine defined in claim 4, wherein said upper part of said clamping frame comprises an upper plate, and said lower part of said clamping frame comprises a lower plate having a through passage opening sized to allow the widened head of said connecting member to pass therethrough, said clamping frame further comprising two mutually opposite, vertically arranged connecting plates connecting said upper plate to said lower plate. 
     
     
       6. The concrete-molding machine defined in claim 5, wherein said slide and said lower plate each have mutually contacting surfaces having inter-engaging elevations and depressions located thereon. 
     
     
       7. The concrete-molding machine defined in claim 3, wherein said inflatable cushion comprises a lifting cushion inserted between said slide and said carrying plate. 
     
     
       8. The concrete-molding machine defined in claim 7, wherein said pneumatic lifting element further comprises a common supporting plate loosely arranged between said lifting cushion and said slide. 
     
     
       9. A concrete-molding machine having a movable ram, and an upper mold part positionable below the movable ram, and comprising: means for clamping the upper mold part to the movable ram in a vibration-resistant manner, said means including: at least one connecting member fastened to the upper mold part, said connecting member comprising a shank, and a widened cross-piece at one end of said shank;   a horizontally arranged carrying plate attached to an underside of the movable ram, said plate having at least one through-passage opening sized to allow the widened piece of said connecting member to pass therethrough so as to receive the shank thereof;   at least one horizontally arranged slide arranged and guided on said plate, said slide having a clearance region with a widened portion and a narrowed portion, and being displaceable from a release position in which the widened cross-piece can pass through the widened portion of the clearance region, to a connecting position in which the shank passes through the narrowed portion and the widened cross-piece rests against said slide; and   at least one pneumatic lifting element located on said carrying plate and being positioned to exert a clamping force against said slide, said pneumatic lifting element comprising: a plurality of supporting elements positioned on said carrying plate,   a base plate resting on said supporting elements,   a clamping frame having an upper part positioned above said base plate, and a lower part passing below said base plate, said slide being positioned between said base plate and said lower part, and   an inflatable cushion fitted on said base plate.       
     
     
       10. The concrete-molding machine defined in claim 9, wherein said upper part of said clamping frame comprises an upper plate, and said lower part of said clamping frame comprises a lower plate having a through passage opening sized to allow the widened cross-piece of said connecting member to pass therethrough, said clamping frame further comprising two mutually opposite, vertically arranged connecting plates connecting said upper plate to said lower plate. 
     
     
       11. The concrete-molding machine defined in claim 10, wherein said slide and said lower plate each have mutually contacting surfaces having inter-engaging elevations and depressions located thereon. 
     
     
       12. A concrete-molding machine having a movable ram, and an upper mold part positionable below the movable ram, and comprising: means for clamping the upper mold part to the movable ram in a vibration-resistant manner, said means including: at least one connecting member fastened to the upper mold part, said connecting member comprising a shank, and a widened cross-piece at one end of said shank;   a horizontally arranged carrying plate attached to an underside of the movable ram, said plate having at least one through-passage opening sized to allow the widened piece of said connecting member to pass therethrough so as to receive the shank thereof;   at least one horizontally arranged slide arranged and guided on said plate, said slide having a clearance region with a widened portion and a narrowed portion, and being displaceable from a release position in which the widened cross-piece can pass through the widened portion of the clearance region, to a connecting position in which the shank passes through the narrowed portion and the widened cross-piece rests against said slide; and   at least one pneumatic lifting element located on said carrying plate and being positioned to exert a clamping force against said slide, said lifting element comprising a lifting cushion inserted between said slide and said carrying plate.     
     
     
       13. The concrete-molding machine defined in claim 12, wherein said pneumatic lifting element further comprises a common supporting plate loosely arranged between said lifting cushion and said slide.